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RISS 인기검색어
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- 저자 : 김만해(M.-H. Kim) (검색결과 2 건)
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라이다와 스카이 라디오미터 관측 자료를 이용한 서울지역 라이다 비의 특성 분석
김만해(M.-H. Kim),김상우(S.-W. Kim),윤순창(S.-C. Yoon),Nobuo Sugimoto,손병주(B.-J. Sohn) 한국기상학회 2011 대기 Vol.21 No.1
Aerosol lidar ratio (extinction-to-backscatter ratio) at 532 ㎚ was determined using 4-year measurements of elastic-backscatter lidar and sky radiometer at Seoul National University of Seoul, Korea. The mean lidar ratio (with standard deviation) based on 4 years of measurements is found to be 61.7±16.5 ㏛, and weak seasonal variations are noted with a maximum in JJA (68.1±16.8 ㏛) and a minimum in DJF (57.2±17.9 ㏛). The lidar ratios for clean, dust, and polluted conditions are estimated to be 45.0±9.5 ㏛, 51.7±13.7 ㏛, and 62.2±13.2 ㏛, respectively. While the lidar ratio for the polluted condition is appears to be consistent with previous studies, clean and dust conditions tend to have larger ratios, compared to previous estimates. This discrepancy is thought to be mainly due to the anthropogenic aerosols existing throughout the year around Seoul, which may cause increased lidar ratios even for clean and dust conditions.
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라만-탄성 라이다를 이용한 황사 및 오염 에어러솔의 라이다 비 측정 연구
윤순창(S.-C. Yoon),이영지(Y.-J. Lee),김상우(S.-W. Kim),김만해(M.-H. Kim),Nobuo Sugimoto 한국기상학회 2010 대기 Vol.20 No.4
The vertical profiles of the extinction coefficient, the backscatter coefficient, and the lidar ratio (i.e., extinction-to-backscattering ratio) for Asian dust and pollution aerosols are determined from Raman (inelastic) and elastic backscatter signals. The values of lidar ratios during two polluted days is found between 52 and 82 sr (July 22, 2009) and 40~60 sr (July 31, 2009) at 52 nm, with relatively low value of particle depolarization ratio (<5%) and high value of sun photometer-derived Angstrom exponent (> 1.2). However, lidar ratios between 25 and 40 sr are found during two Asian dust periods (October 20, 2009 and March 15, 2010), with 10 ~20% of particle depolarization ratio and the relatively low value of sun photometer-derived Angstrom exponent (< 0.39). The lidar ratio, particle depolarization ratio and color ratio are useful optical parameter to distinguish non-spherical coarse dust and spherical fine pollution aerosols. The comparison of aerosol extinction profiles determined from inelastic-backscatter signals by the Raman method and from elastic-backscatter signals by using the Fernald method with constant value of lidar ratio (50 sr) have shown that reliable aerosol extinction coefficients cannot be determined from elastic-backscatter signals alone, because the lidar ratio varies with aerosol types. A combined Raman and elastic backscatter lidar system can provide reliable information about the aerosol extinction profile and the aerosol lidar ratio.
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